Shirley Collins has the original score to the Bellamy songs with the wonderful settings that her late sister Dolly wrote. She has the score in her house and there are no plans to publish it at present.

There are plans to stage it at Sidmouth festival UK this year and if you go to Bellamy Miscellany (a recent thread -Feb) you can find the mudcatter contact. Whether said organiser has or has access to a score I don't know.